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INSTALLATION
!
WARNING
All information in this manual is for
reference and guidance purposes,
and does not substitute for required
professional training, conduct, and strict
adherence to applicable jurisdictional/
professional codes and regulations.
4
CAUTION
Ensure there is not a negative pressure in the
boiler room. The boiler room pressure must
be neutral relative to the outdoors.
Particulate matter or chemicals (example:
chlorine, uorine, perchlorethylene,
halogenated compounds) in the
combustion air supply to the boiler will
cause damage or failure to the burner.
High-risk situations for particulate matter
to be in the air include construction and
maintenance activities. See Table 5.
2-22
Venting Requirements
TABLE 4 GENERAL VENTING PRESSURE REQUIREMENTS
Maximum Combined Pressure Loss:
Net total absolute values of friction losses ("delta-p") of both the
combustion air intake duct (if used) and ue gas exhaust vent
systems must not exceed this value.
Maximum Negative Draft:
The stack e ect (draft, negative vent pressure) as measured at the
boiler ue gas outlet relative to the room pressure must not exceed
this value.
Typical Maximum Equivalent Length (CAI):
Approximate maximum equivalent length of the combustion air
intake (CAI) system. Equivalent lengths can vary by manufactuer,
material, installation methods and site conditions. Consult your
vent supplier for more details.
Typical Maximum Equivalent Length (Flue Gas Vent):
Approximate total maximum equivalent length of the ue gas vent
system. Equivalent lengths can vary by manufacturer, material,
installation methods and site conditions. Consult your vent
supplier for more details.
Mechanical Room Pressure:
Ensure there is not a negative pressure in the boiler room. For safe
and reliable operation, the mechanical space ventilation system
should maintain a neutral pressure relative to the outdoors.
Adhere to the following venting requirements:
1. This boiler can operate to the combined intake and ue exhaust pressure
drops without altering standard capacities: See Table 4.
2. The combined venting system draft pressure readings at the boiler exhaust
connection and air intake connection cannot exceed the maximum
values stated in Table 4; and must remain relatively stable throughout all
operating conditions, including the ignition sequence.
–
NOTE:
Venting pressure is the combined result of frictional pressure drop and
natural draft (stack e ect) in the combustion air intake piping (if used) and ue
gas exhaust system.
3. Drastic draft changes during operation may result in the generation of
excessive carbon monoxide or soot, which may a ect operational reliability
and condition of burner, ignition assembly, or other combustion system
components leading to increased maintenance or replacement of these
items.
4. The equivalent length method is not a substitution for good engineering
practices for determining acceptability of a vent system due to varying
burner modulation rates, ambient air temperatures, and ue gas
temperatures, among other factors. Combustion air intake piping (if used)
must be accounted for in an analysis of the venting system.
5. If the maximum positive pressure loss is exceeded, the boiler may have
to be de-rated or require the installation of draft accessories such as
an engineered exhaust assist fan to prevent operational issues from
SECTION 2
EDR-PURE-IOM-230608
© Fulton Group N.A., Inc. 2023
1.50 "W.C.
- 0.04 "W.C.
100 feet
100 feet
0.0 "W.C.
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